Tach problem 2001 ranger 3.0
Most of the time the Tach works normally but it intermittently drops back to zero for a while then starts working. The speedometer works normally all the time. I am trouble shooting with Ford factory manuals volume 1, volume 2, and wiring diagrams. I do not know what the symbol on page 413-01-25 means (see attached pic). What are the 4 positions?
Any help would be greatly appreciated.